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God’s anger is provoked by disobedience.
Deuteronomy 31:29 For I know that after my death ye will utterly corrupt yourselves, and turn aside from the way which I have commanded you; and evil will befall you in the latter days; because ye will do evil in the sight of the LORD, to provoke him to anger through the work of your hands.
Deuteronomy 32:21 They have moved me to jealousy with that which is not God; they have provoked me to anger with their vanities:
God is slow to anger
Nehemiah 9:17 And refused to obey, neither were mindful of thy wonders that thou didst among them; but hardened their necks, and in their rebellion appointed a captain to return to their bondage: but thou art a God ready to pardon, gracious and merciful, slow to anger, and of great kindness, and forsookest them not.
Psalms 103:8 The LORD is merciful and gracious, slow to anger, and plenteous in mercy.
Nahum 1:3 The LORD is slow to anger, and great in power, and will not at all acquit the wicked:
God’s anger is short-lived.
Psalms 30:5 For his anger endureth but a moment; in his favour is life: weeping may endure for a night, but joy cometh in the morning.
Psalms 103:9 He will not always chide: neither will he keep his anger for ever.
Isaiah 12:1 And in that day thou shalt say, O LORD, I will praise thee: though thou wast angry with me, thine anger is turned away, and thou comfortedst me.
His anger is tempered with mercy.
Micah 7:18 Who is a God like unto thee, that pardoneth iniquity, and passeth by the transgression of the remnant of his heritage? he retaineth not his anger for ever, because he delighteth in mercy.
His anger is modified by compassion.
Psalms 78:38 But he, being full of compassion, forgave their iniquity, and destroyed them not: yea, many a time turned he his anger away, and did not stir up all his wrath.
His anger is deferred for his name’s sake.
Isaiah 48:9 For my name’s sake will I defer mine anger, and for my praise will I refrain for thee, that I cut thee not off.
If men take warning and repent God’s anger is turned from them.
Jonah 4:2 And he prayed unto the LORD, and said, I pray thee, O LORD, was not this my saying, when I was yet in my country? Therefore I fled before unto Tarshish: for I knew that thou art a gracious God, and merciful, slow to anger, and of great kindness, and repentest thee of the evil.
Zephaniah 2:3 Seek ye the LORD, all ye meek of the earth, which have wrought his judgment; seek righteousness, seek meekness: it may be ye shall be hid in the day of the LORD’S anger.
God’s anger is deflected by the prayers of an intercessor.
Deuteronomy 9:20 And the LORD was very angry with Aaron to have destroyed him: and I prayed for Aaron also the same time.
Wickedness maintains God’s anger.
Psalms 7:11 God judgeth the righteous, and God is angry with the wicked every day.
I hope this helps.